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- Title
- EFFECT OF REPEATED FUNCTION ALLOCATION AND RELIABILITY ON AUTOMATION INDUCED MONITORING INEFFICIENCY.
- Creator
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Jones, Lauriann, Mouloua, Mustapha, University of Central Florida
- Abstract / Description
-
The purpose of this study is to extend previous findings of Mouloua, Parasuraman, and Molloy (1993), Parasuraman, Mouloua, and Molloy (1996), Hilburn, Parasuraman, and Mouloua (1996), and Oakley, Mouloua, and Hancock (2003) by: 1) examining the effect of repeated adaptive function allocation to manual control of minimal length (5 minutes) to reduce of human error and minimize workload; 2) explore the placement or timing of adaptive function allocation intervals (approximately 20 minutes of...
Show moreThe purpose of this study is to extend previous findings of Mouloua, Parasuraman, and Molloy (1993), Parasuraman, Mouloua, and Molloy (1996), Hilburn, Parasuraman, and Mouloua (1996), and Oakley, Mouloua, and Hancock (2003) by: 1) examining the effect of repeated adaptive function allocation to manual control of minimal length (5 minutes) to reduce of human error and minimize workload; 2) explore the placement or timing of adaptive function allocation intervals (approximately 20 minutes of automation control to reduce the human operators' monitoring decrement between intervals, maintain adaptive recovery performance levels, and improve response times); 3) examine different levels of automation reliability (30%, 60%, and 90% reliable); 4) explore factors that may be manipulated to reduce automation-induced monitoring inefficiency, increase detection of automation malfunctions, improve situation awareness, reduce response/reaction times, and reduce workload in a simulated complex aviation system. The study was a 2 (non-adaptive control vs. adaptive group) x 3 (30%, 60%, and 90% automation reliability condition) x 4 (repeated 25 minute session) mixed factorial design. Fifty-four undergraduate participants' (i.e., 27 participants per group; 9 participants per condition; at least 18 yrs. of age) percentage of detected malfunctions, response times, and subjective workload were gathered from the Multi-Attribute Task Battery and the NASA TLX. Results indicated a significant improvement in detection of malfunctions and response times during adaptive-function allocation to manual control but without adaptive recovery. There was a significant effect for workload found between baseline measures and experimental sessions by group in the first session but not across experimental sessions. Theoretical and practical implications, limitations and future research are discussed.
Show less - Date Issued
- 2007
- Identifier
- CFE0001874, ucf:47387
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001874
- Title
- ANCHORING ENERGY AND PRETILT ANGLE EFFECTS ON LIQUID CRYSTAL RESPONSE TIME.
- Creator
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Nie, Xiangyi, Wu, Shin-Tson, University of Central Florida
- Abstract / Description
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This dissertation covers some important topics on the liquid crystal-substrate surface effects, including theoretical derivations and confirming experimental results. The research work is expected to make important impacts on liquid crystal device designs and to open new doors for further research along these topics. In this dissertation, a novel high-electric-field technique is developed to characterize the anchoring energy of vertically-aligned liquid crystal cells. Both theoretical...
Show moreThis dissertation covers some important topics on the liquid crystal-substrate surface effects, including theoretical derivations and confirming experimental results. The research work is expected to make important impacts on liquid crystal device designs and to open new doors for further research along these topics. In this dissertation, a novel high-electric-field technique is developed to characterize the anchoring energy of vertically-aligned liquid crystal cells. Both theoretical analyses and confirming experimental results are presented. Vertically-aligned liquid crystal cells with buffed polyimide alignment layers are used to validate the measurement techniques. Based on the voltage-dependent transmittance of the liquid crystal cells, a linear fitting can be obtained, which leads to a precise determination of the anchoring energy. If some specific liquid crystal material parameters are known, then the traditional cell capacitance measurements can be avoided. Anchoring energy and cell gap effects on liquid crystal response time is theoretically analyzed and experimentally investigated. A novel theory on the liquid crystal dynamics is developed. In this part, two different theoretical approaches are discussed: one is surface dynamic equation method and the other is effective cell gap method. These two different approaches lead to consistent results, which are also confirmed by our experimental results. This work opens a new door for LCD industry to optimize liquid crystal response time, and it is especially critical for liquid crystal cells with thin cell gap, which is a promising approach for fast response time liquid crystal display. Pretilt angle effects on liquid crystal dynamics are analyzed theoretically and validated experimentally. Analytical expressions are derived to describe liquid crystal response time under nonzero pretilt angle conditions. The theoretical analysis is confirmed experimentally using vertically-aligned liquid crystal cells. These results quantitatively correlate pretilt angles with liquid crystal response time, which is important for optimizing liquid crystal response time.
Show less - Date Issued
- 2007
- Identifier
- CFE0001927, ucf:47440
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001927
- Title
- TRANSIENT RESPONSE IMPROVEMENT FOR MULTI-PHASE VOLTAGE REGULATORS.
- Creator
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Xiao, Shangyang, Batarseh, Issa, University of Central Florida
- Abstract / Description
-
Next generation microprocessor (Vcore) requirements for high current slew rates and fast transient response together with low output voltage have posed great challenges on voltage regulator (VR) design . Since the debut of Intel 80X86 series, CPUs have greatly improved in performance with a dramatic increase on power consumption. According to the latest Intel VR11 design guidelines , the operational current may ramp up to 140A with typical voltages in the 1.1V to 1.4V range, while the slew...
Show moreNext generation microprocessor (Vcore) requirements for high current slew rates and fast transient response together with low output voltage have posed great challenges on voltage regulator (VR) design . Since the debut of Intel 80X86 series, CPUs have greatly improved in performance with a dramatic increase on power consumption. According to the latest Intel VR11 design guidelines , the operational current may ramp up to 140A with typical voltages in the 1.1V to 1.4V range, while the slew rate of the transient current can be as high as 1.9A/ns [1, 2]. Meanwhile, the transient-response requirements are becoming stringer and stringer. This dissertation presents several topics on how to improve transient response for multi-phase voltage regulators. The Adaptive Modulation Control (AMC) is a type of non-linear control method which has proven to be effective in achieving high bandwidth designs as well as stabilizing the control loop during large load transients. It adaptively adjusts control bandwidth by changing the modulation gain, depending on different load conditions. With the AMC, a multiphase voltage regulator can be designed with an aggressively high bandwidth. When in heavy load transients where the loop could be potentially unstable, the bandwidth is lowered. Therefore, the AMC provides an optimal means for robust high-bandwidth design with excellent transient performance. The Error Amplifier Voltage Positioning (EAVP) is proposed to improve transient response by removing undesired spikes and dips after initial transient response. The EAVP works only in a short period of time during transient events without modifying the power stage and changing the control loop gain. It facilitates the error amplifier voltage recovering during transient events, achieving a fast settling time without impact on the whole control loop. Coupled inductors are an emerging topology for computing power supplies as VRs with coupled inductors show dynamic and steady-state advantages over traditional VRs. This dissertation first covers the coupling mechanism in terms of both electrical and reluctance modeling. Since the magnetizing inductance plays an important role in the coupled-inductor operation, a unified State-Space Averaging model is then built for a two-phase coupled-inductor voltage regulator. The DC solutions of the phase currents are derived in order to show the impact of the magnetizing inductance on phase current balancing. A small signal model is obtained based on the state-space-averaging model. The effects of magnetizing inductance on dynamic performance are presented. The limitations of conventional DCR current-sensing for coupled inductors are addressed. Traditional inductor DCR current sensing topology and prior arts fail to extract phase currents for coupled inductors. Two new DCR current sensing topologies for coupled inductors are presented in this dissertation. By implementation of simple RC networks, the proposed topologies can preserve the coupling effect between phases. As a result, accurate phase inductor currents and total current can be sensed, resulting in excellent current and voltage regulation. While coupled-inductor topologies are showing advantages in transient response and are becoming industry practices, they are suffering from low steady-state operating efficiency. Motivated by the challenging transient and efficiency requirements, this dissertation proposes a Full Bridge Coupled Inductor (FBCI) scheme which is able to improve transient response as well as savor high efficiency at (a) steady state. The FBCI can change the circuit configuration under different operational conditions. Its "flexible" topology is able to optimize both transient response and steady-state efficiency. The flexible core configuration makes implementation easy and clear of IP issues. A novel design methodology for planar magnetics based on numerical analysis of electromagnetic fields is offered and successfully applied to the design of low-voltage high power density dc-dc converters. The design methodology features intense use of FEM simulation. The design issues of planar magnetics, including loss mechanism in copper and core, winding design on PCB, core selections, winding arrangements and so on are first reviewed. After that, FEM simulators are introduced to numerically compute the core loss and winding loss. Consequently, a software platform for magnetics design is established, and optimized magnetics can then be achieved. Dynamic voltage scaling (DVS) technology is a common industry practice in optimizing power consumption of microprocessors by dynamically altering the supply voltage under different operational modes, while maintaining the performance requirements. During DVS operation, it is desirable to position the output voltage to a new level commanded by the microprocessor (CPU) with minimum delay. However, voltage deviation and slow settling time usually exist due to large output capacitance and compensation delay in voltage regulators. Although optimal DVS can be achieved by modifying the output capacitance and compensation, this method is limited by constraints from stringent static and dynamic requirements. In this dissertation, the effects of output capacitance and compensation network on DVS operation are discussed in detail. An active compensator scheme is then proposed to ensure smooth transition of the output voltage without change of power stage and compensation during DVS. Simulation and experimental results are included to demonstrate the effectiveness of the proposed scheme.
Show less - Date Issued
- 2008
- Identifier
- CFE0002397, ucf:47738
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002397
- Title
- THE EFFECTS OF ECOTOURISM ON POLAR BEAR BEHAVIOR.
- Creator
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Eckhardt, Gillian, Waterman, Jane, University of Central Florida
- Abstract / Description
-
Polar bears spend the majority of their lives on the sea ice, where they gain access to seals and mates. In western Hudson Bay, the sea ice melts for three to four months in the summer, and polar bears there are forced onto land. These bears live on their fat reserves for the duration of the iceless period, until temperatures get colder in the fall and freeze up begins. The aggregation of polar bears near Churchill, Manitoba during the ice free period has led to a thriving tourist industry,...
Show morePolar bears spend the majority of their lives on the sea ice, where they gain access to seals and mates. In western Hudson Bay, the sea ice melts for three to four months in the summer, and polar bears there are forced onto land. These bears live on their fat reserves for the duration of the iceless period, until temperatures get colder in the fall and freeze up begins. The aggregation of polar bears near Churchill, Manitoba during the ice free period has led to a thriving tourist industry, with a large influx of tourists visiting Churchill in the fall in a six to eight week period, yet little is known about the impacts of this industry on the biology of the bears. This study investigated the effect of tourist vehicles and human presence on the behavior of polar bears over the fall of 2003 and 2004. Overall time budgets were estimated for bears, and the behavior of males and females was compared. Females spent significantly less time lying and more time in locomotion than males. Time budgets were also estimated for bears in the presence and absence of tourist vehicles. Bears spent less time lying and more time in a sit/stand position in the presence of vehicles. Air temperature had no significant effect on the time budgets of polar bears. Tundra vehicle approaches were manipulated to determine effects on polar bear behavior, and to investigate any variables that significantly affected response, including habituation. A response was defined as any sudden whole body movement or change in position or behavior at the time of approach. A total of 25% of all bears responded to the experimental vehicle approach. For bears that responded to approach, the average distance at response was 43 m. The average speed of the vehicle was 0.66 ± 0.02 m/s (range 0.23 to 1.15 m/s). Approach variables that significantly influenced the likelihood of response of a bear to an approaching vehicle included angle of approach and vehicle speed. Direct approaches, in which the bear was in the path of the moving vehicle, had a higher probability of eliciting a response than indirect approaches, in which the vehicle stayed to one side of the bear at all times. Higher speeds of the vehicle increased the probability of a response by a bear. Behaviors of the bear that significantly predicted a response were shifting of the body and smacking of the lips. A playback study was conducted to determine the effects of human induced sound on polar bears. There was no significant effect of human sound on polar bears. Results presented here provide the first experimental evidence of variables in the tourist industry that affect polar bear behavior, and the first evidence of behavioral cues predicting a response to vehicle approach.
Show less - Date Issued
- 2005
- Identifier
- CFE0000544, ucf:46441
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000544
- Title
- THE EFFECTS OF DIFFERENTIAL ITEM FUNCTIONING ON PREDICTIVE BIAS.
- Creator
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Bryant, Damon, Stone-Romero, Eugene, University of Central Florida
- Abstract / Description
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The purpose of this research was to investigate the relation between measurement bias at the item level (differential item functioning, dif) and predictive bias at the test score level. Dif was defined as a difference in the probability of getting a test item correct for examinees with the same ability but from different subgroups. Predictive bias was defined as a difference in subgroup regression intercepts and/or slopes in predicting a criterion. Data were simulated by computer. Two...
Show moreThe purpose of this research was to investigate the relation between measurement bias at the item level (differential item functioning, dif) and predictive bias at the test score level. Dif was defined as a difference in the probability of getting a test item correct for examinees with the same ability but from different subgroups. Predictive bias was defined as a difference in subgroup regression intercepts and/or slopes in predicting a criterion. Data were simulated by computer. Two hypothetical subgroups (a reference group and a focal group) were used. The predictor was a composite score on a dimensionally complex test with 60 items. Sample size (35, 70, and 105 per group), validity coefficient (.3 or .5), and the mean difference on the predictor (0, .33, .66, and 1 standard deviation, sd) and the criterion (0 and .35 sd) were manipulated. The percentage of items showing dif (0%, 15%, and 30%) and the effect size of dif (small = .3, medium = .6, and large = .9) were also manipulated. Each of the 432 conditions in the 3 x 2 x 4 x 2 x 3 x 3 design was replicated 500 times. For each replication, a predictive bias analysis was conducted, and the detection of predictive bias against each subgroup was the dependent variable. The percentage of dif and the effect size of dif were hypothesized to influence the detection of predictive bias; hypotheses were also advanced about the influence of sample size and mean subgroup differences on the predictor and criterion. Results indicated that dif was not related to the probability of detecting predictive bias against any subgroup. Results were inconsistent with the notion that measurement bias and predictive bias are mutually supportive, i.e., the presence (or absence) of one type of bias is evidence in support of the presence (or absence) of the other type of bias. Sample size and mean differences on the predictor/criterion had direct and indirect effects on the probability of detecting predictive bias against both reference and focal groups. Implications for future research are discussed.
Show less - Date Issued
- 2004
- Identifier
- CFE0000157, ucf:46160
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000157
- Title
- WORKING MEMORY, SEARCH, AND SIGNAL DETECTION: IMPLICATIONS FOR INTERACTIVE VOICE RESPONSE SYSTEM MENU DESIGN.
- Creator
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Commarford, Patrick, Smither, Janan, University of Central Florida
- Abstract / Description
-
Many researchers and speech user interface practitioners assert that interactive voice response (IVR) menus must be relatively short due to constraints of the human memory system. These individuals commonly cite Miller's (1956) paper to support their claims. The current paper argues that these authors commonly misuse the information provided in Miller's paper and that hypotheses drawn from modern theories of working memory (e.g., Baddeley and Hitch, 1974) would lead to the opposite conclusion...
Show moreMany researchers and speech user interface practitioners assert that interactive voice response (IVR) menus must be relatively short due to constraints of the human memory system. These individuals commonly cite Miller's (1956) paper to support their claims. The current paper argues that these authors commonly misuse the information provided in Miller's paper and that hypotheses drawn from modern theories of working memory (e.g., Baddeley and Hitch, 1974) would lead to the opposite conclusion – that reducing menu length by creating a greater number of menus and a deeper structure will actually be more demanding on users' working memories and will lead to poorer performance and poorer user satisfaction. The primary purpose of this series of experiments was to gain a greater understanding of the role of working memory in speech-enabled IVR use. The experiments also sought to determine whether theories of visual search and signal detection theory (SDT) could be used to predict auditory search behavior. Results of this experiment indicate that creating a deeper structure with shorter menus is detrimental to performance and satisfaction and more demanding of working memory resource. Further the experiment provides support for arguments developed from Macgregor, Lee, and Lam's dual criterion decision model and is a first step toward applying SDT to the IVR domain.
Show less - Date Issued
- 2006
- Identifier
- CFE0000987, ucf:46715
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000987
- Title
- THE EFFECTS OF CORPORATE SOCIAL RESPONSIBILITY ON FINANCIAL PERFORMANCE.
- Creator
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Mentor, Marly, Roberts, Robin, Gatchev, Vladimir, University of Central Florida
- Abstract / Description
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Companies have taken the initiative to be socially responsible over the years. In the past, the focus for companies has been on maximizing wealth. With the growth of corporate social responsibility (CSR), there has been many debates regarding its benefits. More companies are beginning to realize the value of being socially responsible and how critical it is to business function. This paper researches past studies on the relationship between corporate social responsibility and financial...
Show moreCompanies have taken the initiative to be socially responsible over the years. In the past, the focus for companies has been on maximizing wealth. With the growth of corporate social responsibility (CSR), there has been many debates regarding its benefits. More companies are beginning to realize the value of being socially responsible and how critical it is to business function. This paper researches past studies on the relationship between corporate social responsibility and financial performance. This relationship is then tested using a reliable source of data on corporate social responsibility performance. This study uniquely looks at the accounting and market-based measurements of financial performance. The dataset includes most of the S&P 500 firms and covers years 2005-2014. An empirical model is constructed which includes factors that were found significant in the works of Capon, Farley, and Hoenig (1990). The relationships are tested using cross-sector/panel data time-series regressions. Results indicate that CSR and the accounting measurements of financial performance are positively related. CSR and the market-based measurements of financial performance are negatively related. This suggests that CSR positively affects a company�s profits and negatively affects future stock returns. One interpretation of this result is that socially responsible stocks have a lower required rates of return. The results indicate that since investors are more willing to invest in CSR stocks, these firms end up experiencing lower future stock returns. The results are consistent with past studies and support the hypotheses.
Show less - Date Issued
- 2016
- Identifier
- CFH2000047, ucf:45506
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000047
- Title
- HOW THE BODY MOVES THE MIND: EXPLORING THE EFFECTS OF PERSPECTIVE OF PHYSICAL SENSATION ON EMBODIED STATES AND PERCEPTION.
- Creator
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Satoski, Kathryn G, Chin, Matthew, University of Central Florida
- Abstract / Description
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The purpose of this thesis is to explore how surface engagement through touch affects perception of stimuli and mood. Researchers have found psychological, physiological and cognitive benefits associated with exposure to and interaction with nature. Stress Reduction Theory with Psychoevolutionary framework, and Attention Restoration Theory are often used to explain and interpret results. However, studies that focus on individuals with negative perspectives of nature find a positive affective...
Show moreThe purpose of this thesis is to explore how surface engagement through touch affects perception of stimuli and mood. Researchers have found psychological, physiological and cognitive benefits associated with exposure to and interaction with nature. Stress Reduction Theory with Psychoevolutionary framework, and Attention Restoration Theory are often used to explain and interpret results. However, studies that focus on individuals with negative perspectives of nature find a positive affective response to nature is not universal. Rather, individuals respond differently based on their own experience with nature. Childhood exposure and culture have been found to influence attitudes towards nature. Theories of embodied cognition emphasize the importance of previously learned associations and embodied states have been found to influence judgment, experience of emotions, and physiological states. To assess whether an individual's attitude towards nature influences the embodiment of a positive or negative state, participants were randomly assigned to come into physical contact with one of four surfaces with their feet: grass, fake grass, dirt and cement. Individuals affective, cognitive and physical relationship with nature was measured with the Nature Relatedness Scale. Change in perception of neutral stimuli and mood before and after surface exposure were measured. Results suggested surfaces influenced mood in different ways, however the effects on perception were unclear. A participant's perspective of nature did not seem to influence mood change depending on surface type. Future research is needed to assess whether the shift in mood was based on metaphors of language, priming from surface texture, or a result of complex interaction between bodily sensations and cognition.
Show less - Date Issued
- 2019
- Identifier
- CFH2000487, ucf:45769
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000487
- Title
- Reconceptualizing Responsiveness for Network Governance: Insights from Cross-Sector Efforts to Assist the Displaced Population From Puerto Rico in Central Florida.
- Creator
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Prysmakova, Safiya, Bryer, Thomas, Hu, Qian, Sadiq, Abdul-Akeem, Piccolo, Ronald F, Meek, Jack, University of Central Florida
- Abstract / Description
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This study further expands current knowledge on responsiveness in the public administration field and examines factors that contribute to more responsive public service delivery networks. This research reconceptualized the concept of responsiveness under the lens of New Public Governance as a legitimate democratic public value and answered the following research questions: What constructs constitute to the concept of public service responsiveness? How can public service responsiveness be...
Show moreThis study further expands current knowledge on responsiveness in the public administration field and examines factors that contribute to more responsive public service delivery networks. This research reconceptualized the concept of responsiveness under the lens of New Public Governance as a legitimate democratic public value and answered the following research questions: What constructs constitute to the concept of public service responsiveness? How can public service responsiveness be measured at the network level? Does the complexity of public service provision affect perceived public service network responsiveness? How do collaborative processes across network partners, community support, and resource munificence affect the responsiveness of public delivery networks? The study utilized a multi-method case study approach. The case of the study is focused on the cross-sector efforts in response to the crisis, caused by the massive displacement of the Puerto Rican population to Central Florida after Hurricane Maria. The data was collected using surveys administrated to the displaced population, and interviews conducted with the managers of service delivery organizations. Using quantitative methods, this study developed a valid and reliable model for measuring perceived public service network responsiveness, which is built on the constructs that include the sufficiency of service provision, dignity, clarity of communication and public engagement. The findings suggested that the displaced population that sought a higher number of low complexity services had a more negative perception of public service network responsiveness. The study suggested that negative perception in low complexity service provision can be caused by the low capability of the public service system and low level of public input, and can be characterized as (")consumeristic(") approach. The qualitative findings showed that collaborative processes can affect the responsiveness of public service networks. Increased community support proved to be a positive factor for public service network responsiveness, while a lack of flexible funding is a negative factor for public service network responsiveness.
Show less - Date Issued
- 2019
- Identifier
- CFE0007852, ucf:52762
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007852
- Title
- A Study of Perceptions on Incident Response Exercises, Information Sharing, Situational Awareness, and Incident Response Planning in Power Grid Utilities.
- Creator
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Garmon, Joseph, Karwowski, Waldemar, Hancock, Peter, Elshennawy, Ahmad, Wan, Thomas, University of Central Florida
- Abstract / Description
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The power grid is facing increasing risks from a cybersecurity attack. Attacks that shut off electricity in Ukraine have already occurred, and successful compromises of the power grid that did not shut off electricity to customers have been privately disclosed in North America. The objective of this study is to identify how perceptions of various factors emphasized in the electric sector affect incident response planning. Methods used include a survey of 229 power grid personnel and the use...
Show moreThe power grid is facing increasing risks from a cybersecurity attack. Attacks that shut off electricity in Ukraine have already occurred, and successful compromises of the power grid that did not shut off electricity to customers have been privately disclosed in North America. The objective of this study is to identify how perceptions of various factors emphasized in the electric sector affect incident response planning. Methods used include a survey of 229 power grid personnel and the use of partial least squares structural equation modeling to identify causal relationships. This study reveals the relationships between perceptions by personnel responsible for cybersecurity, regarding incident response exercises, information sharing, and situational awareness, and incident response planning. The results confirm that the efforts by the industry on these topics have advanced planning for a potential attack.
Show less - Date Issued
- 2019
- Identifier
- CFE0007805, ucf:52349
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007805
- Title
- Power to the People: Responsible Facilitation in Co-Creative Story-Making.
- Creator
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Hill, Amanda, Weaver, Earl, Wood, Vandy, Kovac, Kim, Snyder, Tara, University of Central Florida
- Abstract / Description
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Power to the People: Responsible Facilitation in Co-Creative Story-Making describes and applies a tool for recording and analyzing the co-productive creation process of digital storytelling (DST) workshops to be used by project facilitators for the purposes of reflection and for developing an ethics of responsibly in story-making practices. It provides a method for analyzing digital storytelling practices that focuses on the rhetorical, dialogic, co-productive, creative story-making space...
Show morePower to the People: Responsible Facilitation in Co-Creative Story-Making describes and applies a tool for recording and analyzing the co-productive creation process of digital storytelling (DST) workshops to be used by project facilitators for the purposes of reflection and for developing an ethics of responsibly in story-making practices. It provides a method for analyzing digital storytelling practices that focuses on the rhetorical, dialogic, co-productive, creative story-making space rather than the finished stories or the technologies. Looking through a new media lens, this dissertation aligns the DST genre and practice in relation to alternative media broadly, and tactical media specifically, to understand DST as a resource for storytellers. This dissertation situates DST as a co-creative media process created among participants, individual storytellers, facilitators, institutions, and the audience, and discusses the inter-relationships within the workshop setting as well as in those found in the dissemination of the final digital stories. The author discusses the relationships among the storytellers and the facilitators, the other workshop participants, and the viewing audience, examining this final relationship in terms of face-to-face and digital interactions. This dissertation provides a reflexive look at the responsibility of the facilitator in co-creative digital storytelling endeavors and makes use of diverse international case studies in addition to an analysis of the author's own facilitated project, (")Exploring Our Information Diets,(") as examples. The author argues that co-creative storymaking facilitators should interpret their roles within the collaborative creation process to ensure that responsible facilitation practices based in (")witnessing(") guide the storytelling process, and create an environment that treats participants as subjects with the ability to respond to the world.
Show less - Date Issued
- 2018
- Identifier
- CFE0007572, ucf:52568
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007572
- Title
- THE EFFECT OF COMBAT EXERCISES ON CARDIOVASCULAR RESPONSE: AN EXPLORATORY STUDY.
- Creator
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Gantt, MeLisa, Sole, Mary Lou, University of Central Florida
- Abstract / Description
-
PURPOSE: Hypertension (HTN) affects one in every three adults in the United States. Often associated with the older population, this silent killer has emerged in an unsuspecting group, young military soldiers. With the rapid succession of multiple deployments, long intervals between blood pressure (BP) assessments, and the absence of cardiovascular (CV) measures during the pre and post deployment health screenings; soldiers may be at higher risk for HTN than their civilian counterparts of the...
Show morePURPOSE: Hypertension (HTN) affects one in every three adults in the United States. Often associated with the older population, this silent killer has emerged in an unsuspecting group, young military soldiers. With the rapid succession of multiple deployments, long intervals between blood pressure (BP) assessments, and the absence of cardiovascular (CV) measures during the pre and post deployment health screenings; soldiers may be at higher risk for HTN than their civilian counterparts of the same age. The purpose of this study was to explore real-time continuous CV measures of soldiers before, during, and after exposure to a simulated combat stressor as well as to assess which personal characteristics played a significant role. METHODS: Applying the Allostasis/Allostatic Load theoretical framework, a repeated measure quasi-experimental design was used to compare the CV measures of two groups: one exposed to a physical combat stressor (experimental) and the other exposed to a psychological combat stressor (control). A convenience sample of 60 college Army Reserve Officer Training Corps cadets were fitted with Tiba Medical Ambulo 2400 ambulatory BP monitors for 48 continuous hours. Several CV indices were analyzed using one-way Analysis of Variance (ANOVA), paired t-test, and independent sample t-test. Four instruments (Participant Information Sheet, State-Trait Anxiety Inventory, Paintball Perceived Stress Questionnaire, and Army Physical Fitness Test) were used to assess which characteristics played the most significant role in the CV response. RESULTS: Demographic characteristics between the two 30-cadet groups were not statistically different, with the exception of deployment history (experimental = 4, control= 0). Hours after the stress exposure, subjects in the experimental group had a higher mean awake systolic blood pressure (SBP) when compared to the control group (113.76 mm Hg vs 102.98 mm Hg, p= 009). When assessing pre and post stressor morning BP surge and evening BP decline, the control group showed the biggest change. Significant bivariate correlations (p < .05) found that: Females consistently had higher pulse rates (PR) throughout each of the phases. Age positively correlated with elevated BP during the stressor, and increased morning BP surge post stressor. African Americans had higher sleep BPs pre stressor, and decreased SBP recovery post stressor; Hispanics had higher PRs during and after the stressor. Waist circumference positively correlated with elevated BP morning surge pre stressor but, body mass index (BMI) positively correlated with elevated BP morning surge post stressor as well as elevated BP during the stressor. Family history of HTN played no significant role; however, deployment history correlated with mean awake SBP post stressor. Trait anxiety scores negatively correlated with SBP recovery while state anxiety scores positively correlated with post stressor awake mean arterial pressure and evening SPB decline. Perceived stress during the stressor negatively correlated with post stressor SBP morning surge with females reporting higher anxiety and stress. Finally, Army Physical Fitness (APFT) total scores as well as APFT run scores negatively correlated with pre and post stressor sleep PRs. DISCUSSION/IMPLICATIONS: Age, female gender, African American descent, Hispanic ethnicity, waist circumference, BMI, previous deployment history, level of fitness and the psychological stress state during and after a stressor played significant roles in soldiersÂÂÂÂ' CV response. SBP was the most dynamic and informative of the CV indices and a psychological stressor was comparable to a physical stressor when observing the residual effect of stress. If a combat exercise was enough of a stressor to produce residual CV effects that lasted well into following morning, the residual effect of a lengthy strenuous deployment may be alarming. This study not only provided a snapshot of the CV health of incoming young soldiers, but also provided evidence to support policy change regarding the implementation of regular CV health assessments before and after deployment.
Show less - Date Issued
- 2010
- Identifier
- CFE0003390, ucf:48458
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003390
- Title
- GENERAL MANAGERS‟ PERCEPTIONS OF CORPORATE SOCIAL RESPONSIBILITY IN FLORIDA HOTELS.
- Creator
-
Holcomb, Judith, Pizam, Abraham, University of Central Florida
- Abstract / Description
-
The objective of the study was to identify and measure the magnitude of the gap that may exist between the corporate level Corporate Social Responsibility (CSR) culture and its ensuing policies and their equivalent at the property level. This gap was hypothesized to be a function of a number of personal characteristics of the General Managers (GMs) coupled with the organizational profile of the hotel. The data were collected via an online survey based on a CSR scale developed by Turker (2009)...
Show moreThe objective of the study was to identify and measure the magnitude of the gap that may exist between the corporate level Corporate Social Responsibility (CSR) culture and its ensuing policies and their equivalent at the property level. This gap was hypothesized to be a function of a number of personal characteristics of the General Managers (GMs) coupled with the organizational profile of the hotel. The data were collected via an online survey based on a CSR scale developed by Turker (2009) in combination with other original and previously used smaller scales. The study‟s population consisted of general managers of hotels that were managed by a corporate office and were members of the Central Florida Hotel and Lodging Association and the Florida Restaurant and Lodging Association. In total, 564 hotel GMs were contacted by email by their perspective associations and invited to participate in the study. A total of 123 surveys were returned which equated to a 22% response rate. The results indicated that the gaps for all factors were very small. This suggested that based on the GMs‟ perceptions, there was not much variation between their corporations‟ CSR policies and their properties‟ CSR policies. Hence, because of this small variation, it can be speculated that, in this study, hotel GMs were committed to follow precisely the corporate CSR policies and initiatives at their property levels. Notwithstanding the above, the results supported three hypotheses as follows: (a) the more GMs were involved in the community, the less they were committed to CSR policies relating to the government; (b) the more hours per week GMs spent in community volunteerism, the higher was their commitment to overall CSR policies; and c) the higher was the demonstrated commitment of GMs to their corporation‟s CSR policy regarding responsibility to employees, the more they were rewarded through non-monetary perceived personal success. This study and its ensuing results were of significant importance to the general CSR body of knowledge and unique in terms of their contribution to CSR in the hotel industry. The practical implication from this study was that it sets a number of benchmarks relating to CSR corporate and property level policies and initiatives in a given sector of the hotel industry. In addition, due to the fact that few, if any, gaps were found between the corporate and property level cultures, corporate officers can at least feel fairly comfortable that from the GMs‟ perspectives, CSR initiatives are being implemented at the property level in accordance with corporate policy.
Show less - Date Issued
- 2010
- Identifier
- CFE0003466, ucf:48960
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003466
- Title
- THE IMPACT OF CONTINUING EDUCATION MODULES ON THE MORAL OBLIGATIONS AND RESPONSIBILITIES OF FINANCIAL ADVISORS.
- Creator
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Modell, Sandy, Stanlick, Nancy, University of Central Florida
- Abstract / Description
-
Increased life expectancies and a significant reduction in the number of corporate pension plans nationwide have made the prospects of retirement a challenge for many of us. The burden of funding retirement will move from the corporation or government to the individual. Those individuals with limited financial experience will most likely need the guidance of a financial advisor. Can we trust and rely upon them? Following the 2004 late trading scandal and the 2008 financial meltdown, the...
Show moreIncreased life expectancies and a significant reduction in the number of corporate pension plans nationwide have made the prospects of retirement a challenge for many of us. The burden of funding retirement will move from the corporation or government to the individual. Those individuals with limited financial experience will most likely need the guidance of a financial advisor. Can we trust and rely upon them? Following the 2004 late trading scandal and the 2008 financial meltdown, the Financial Industry Regulatory Authority ("FINRA") implemented Continuing Education requirements at the advisor level. The intent was to improve the quality and integrity of advisors' interaction with clients. I have interviewed forty-one advisors at four separate financial services firms to examine the impact of this training on the moral obligations and responsibilities of financial advisors
Show less - Date Issued
- 2011
- Identifier
- CFE0003907, ucf:48715
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003907
- Title
- PERSONAL PERCEPTIONS AND ORGANIZATIONAL FACTORS INFLUENCING POLICE DISCRETION: THE CASE OF TURKISH PATROL OFFICERS' RESPONSIVENESS.
- Creator
-
Tasdoven, Hidayet, Kapucu, Naim, University of Central Florida
- Abstract / Description
-
Police officers make decisions at the street level in a variety of situations that have direct impact on quality of life, justice in society, and individual freedom. These decisions inherently involve the exercise of discretion, since successfully performed police tasks are linked to the officer's choosing among alternative courses of action. Appropriateness of unsupervised decisions taken under street contingencies remains questionable in terms of police-behavior legitimacy. Law enforcement...
Show morePolice officers make decisions at the street level in a variety of situations that have direct impact on quality of life, justice in society, and individual freedom. These decisions inherently involve the exercise of discretion, since successfully performed police tasks are linked to the officer's choosing among alternative courses of action. Appropriateness of unsupervised decisions taken under street contingencies remains questionable in terms of police-behavior legitimacy. Law enforcement agencies seek ways to control excessive discretion to avoid undesired consequences of police discretion and maintain organizational legitimacy. Traditionally, organizations developed reward and sanction structures that aimed to shape officer behavior on the street. Recent perspectives, on the other hand, emphasize that it is imperative to manage discretion by employing a value-based approach that requires the agency to encourage subordinates in the exercise of certain behaviors simply because they are believed to be right and proper. This approach depends primarily on beliefs, values, and attitudes of employees rather than external contingencies of environment. Drawing on expectancy and value-based approaches, this study examines the factors affecting patrol officers' discretionary decisions to enforce law in the Turkish National Police (TNP). The reward expectancy concept was derived from the expectancy theory of motivation, which uses extrinsic rewards in structuring discretion. Regarding the value-based approach, public service motivation (PSM) represents the intrinsic motives of officers in this study, while selective enforcement corresponds to the attitudes of officers. Discretionary behaviors of officers on the street were conceptualized as responsiveness, which refers to the degree to which officers iv are willing to respond to street contingencies. The study tested the mediating role of work effort between reward expectancy/responsiveness and public service motivation/responsiveness relationships. Samples of the study were drawn from uniformed patrol officers in seven provinces of Turkey. A self-administered questionnaire was used to collect data. Responses of 613 patrol officers were analyzed using structural equation modeling (SEM). The study developed four latent constructs and validated their measurement models by using confirmatory factor analysis (CFA). Structural equation modeling was used to investigate causal and confirmatory relationships among latent variables. Findings of the study suggested that reward expectancy did not have a statistically significant relationship to responsiveness. The study did not find a significant association between reward expectancy and work effort of officers. This finding was found to be attributable to the fact that officers do not believe in the fair distribution procedures of rewards and they do not value organizational rewards. Public service motivation of respondents, on the other hand, indicated a strong, positive, and statistically significant relationship with both work effort and responsiveness. These results indicated that intrinsic motives of officers in the TNP are more powerful in explaining officer responsiveness to street contingencies. As hypothesized, officer attitudes toward selective enforcement negatively influenced officer responsiveness, indicating that officers' beliefs and values influence their discretionary behaviors. Among the demographic characteristics of participants, only age of officer indicated a negative significant relationship to responsiveness. This finding suggested that motivation decreases as age increases. Contrary to other findings in the literature, this study found that intensity perceptions of respondents was positively associated with responsiveness. The study revealed some policy, theoretical, and methodological implications. The findings suggested that the TNP should either completely eliminate the existing reward system or revise it to motivate officers to be responsive. A leadership practice that promotes PSM and discourages selective enforcement was also suggested. Contrary to research that emphasizes the role of extrinsic motivation on police discretion, this study empirically reported that intrinsic motivation has an even stronger effect on officer behavior and needs to be taken into account in future studies. The study contributes to an understanding of police discretionary behavior in the TNP, which has unique characteristics of structure, culture, and law. The limitations of the study in terms of its dependency on officer perceptions and concerns about construct validity were discussed and future research was suggested.
Show less - Date Issued
- 2011
- Identifier
- CFE0003886, ucf:48734
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003886
- Title
- VIE-ing for the Position: An Examination of the Motivational Antecedents of Response Distortion.
- Creator
-
Mihm, David, Jentsch, Kimberly, Wang, Wei, Joseph, Dana, Piccolo, Ronald, University of Central Florida
- Abstract / Description
-
Faking on self-report personality tests is a widespread practice which degrades the construct validity of personality tests when they are used in personnel selection contexts and may lead to suboptimal hiring decisions (Donovan, Dwight, (&) Hurtz, 2003; Schmit (&) Ryan, 1993). While much is known about the factors which enable job applicants to successfully engage in faking (Tett, Freund, Christiansen, Fox, (&) Coaster, 2012), far less is known about how specific applicant perceptions...
Show moreFaking on self-report personality tests is a widespread practice which degrades the construct validity of personality tests when they are used in personnel selection contexts and may lead to suboptimal hiring decisions (Donovan, Dwight, (&) Hurtz, 2003; Schmit (&) Ryan, 1993). While much is known about the factors which enable job applicants to successfully engage in faking (Tett, Freund, Christiansen, Fox, (&) Coaster, 2012), far less is known about how specific applicant perceptions throughout the hiring process influence their decision to engage in this practice. To this end, this study applied Vroom's (1964) expectancy theory to the study of applicant faking. Following the work of prior researchers (Peterson, Griffith, (&) Converse, 2009), this study incorporated an experimental paradigm in which participants were led to believe that they were completing a personality test as part of the hiring process.Results of the study suggested that applicant faking on personality tests within personnel selection contexts is largely driven by valence (the extent to which applicants perceive the job to which they are applying as desirable) and expectancy judgments (an applicant's self-efficacy regarding their ability to successfully engage in faking). However, the three-way interaction between valence, instrumentality, and expectancy judgments which forms the crux of Vroom's (1964) theory did not demonstrate a significant impact on subsequent faking. A positive relationship between cognitive ability and faking was also found, suggesting that highly intelligent job applicants are more prone to engage in this behavior. In addition, applicant integrity demonstrated no relationship to faking behavior, suggesting that job applicants may not view the practice as being unethical. The potential implications of these findings in real-world selection contexts was discussed.
Show less - Date Issued
- 2017
- Identifier
- CFE0006627, ucf:51298
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006627
- Title
- Intrinsic Modulation Response Modeling and Analysis for Lithographic Vertical-Cavity Surface-Emitting Lasers.
- Creator
-
Li, Mingxin, Deppe, Dennis, Fathpour, Sasan, Wu, Shintson, Malocha, Donald, University of Central Florida
- Abstract / Description
-
Vertical-cavity surface-emitting lasers (VCSELs) have been greatly improved and successfully commercialized over the past few decades owing to their ability to provide both mode and current confinement that enables low energy consumption, high efficiency and high modulation speed. However, further improvement of oxide VCSELs is limited by the nature of the oxide aperture because of self-heating, internal strain and difficulties in precise size control. In this dissertation, VCSELs using...
Show moreVertical-cavity surface-emitting lasers (VCSELs) have been greatly improved and successfully commercialized over the past few decades owing to their ability to provide both mode and current confinement that enables low energy consumption, high efficiency and high modulation speed. However, further improvement of oxide VCSELs is limited by the nature of the oxide aperture because of self-heating, internal strain and difficulties in precise size control. In this dissertation, VCSELs using lithographic approach are demonstrated to overcome the limitations of oxide VCSELs, in which an intra-cavity phase shifting mesa is applied to define the device size and provide optical mode and electrical current confinement instead of an oxide aperture. A newly developed model of intrinsic modulation response is proposed and analyzed to focus on the thermal limit of the modulation speed of VCSELs. The results show that both the temperature dependent differential gain and stimulated emission rate impact laser speed and the stimulated emission rate dominates the speed limit. Thermal limits of modulation response are compared for oxide and lithographic VCSELs for various sizes. The results predict that the intrinsic modulation response can be significantly increased by using lithographic VCSELs due to low thermal resistance and reduced mode volume while maintaining high efficiency. The intrinsic bandwidth could exceed 100 GHz for a 2-?m-diameter lithographic VCSEL. Combined with low electrical parasitics, it is expected to produce over 100 Gb/s data rate from a single directly modulated laser. VCSELs designed for high speed are discussed and their characteristics are demonstrated.
Show less - Date Issued
- 2016
- Identifier
- CFE0006346, ucf:51556
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006346
- Title
- Faculty Knowledge and Readiness in Reporting Student Victimization Disclosure and Title IX Compliance.
- Creator
-
Malick, Abigail, Jasinski, Jana, Wright, James, Grauerholz, Liz, University of Central Florida
- Abstract / Description
-
The U.S. Department of Education and Title IX Educational Act of 1972 shaped the way institutions of higher education address and prevent student victimizations. The law originally sought to eliminate sex-based discrimination in education but has evolved to include sexual misconduct. Since the Dear Colleague Letter of 2011, the position of institutions has changed significantly in the way they address student victimization as it relates to dating violence, sexual assault, and stalking ...
Show moreThe U.S. Department of Education and Title IX Educational Act of 1972 shaped the way institutions of higher education address and prevent student victimizations. The law originally sought to eliminate sex-based discrimination in education but has evolved to include sexual misconduct. Since the Dear Colleague Letter of 2011, the position of institutions has changed significantly in the way they address student victimization as it relates to dating violence, sexual assault, and stalking (Rosenthal, 2017). One requirement is that institutions inform and train Responsible Employees to report when a student discloses experiencing sexual misconduct, including dating violence, sexual assault, or stalking. The purpose of this study was to examine faculty members' knowledge of the Title IX Responsible Employee mandate, their experience with reporting student disclosures, and additional resources needed to aid faculty members with this reporting duty. Data were collected through semi-structured interviews with 34 faculty members at a large research-intensive four-year university in the Southeastern United States. The main findings relate to Responsible Employee trainings, reporting guidelines, issues that might arise for faculty during the disclosure/reporting process, and recommendations to thoughtfully and strategically engage faculty. Universities and colleges that include faculty members as Responsible Employees need to ensure that their institution is fulfilling its requirement from the U.S. Department of Education but must also do their best to prepare and support faculty so faculty can perform their reporting duties. In many cases, faculty members are on the front line when it comes to interacting with and being in a position to help their students. They need specific measures and resources to ensure that they are able to fulfill all their various duties as faculty members, including handling a student's victimization disclosure and then reporting the incident to the Title IX Coordinator so that the university can serve its students to the best of its ability.
Show less - Date Issued
- 2017
- Identifier
- CFE0006895, ucf:51719
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006895
- Title
- Examining multi-level and inter-organizational collaborative response to disasters: The case of Pakistan Floods in 2010.
- Creator
-
Khosa, Sana, Kapucu, Naim, Wan, Thomas, Knox, Claire, Sadri, Houman, University of Central Florida
- Abstract / Description
-
Catastrophic disasters are different than routine disasters and managing them requires the mobilization of inter-organizational, inter-governmental, cross-sectoral and international humanitarian support. The role of the international community through International Non-governmental Organizations (INGOs), and multi-lateral organizations such as the United Nations (UN) becomes imperative when the scale of the disaster is unprecedented and difficult for a country to manage on its own. The...
Show moreCatastrophic disasters are different than routine disasters and managing them requires the mobilization of inter-organizational, inter-governmental, cross-sectoral and international humanitarian support. The role of the international community through International Non-governmental Organizations (INGOs), and multi-lateral organizations such as the United Nations (UN) becomes imperative when the scale of the disaster is unprecedented and difficult for a country to manage on its own. The initial response and relief phase of managing disasters is one in which many agencies with different expertise, capacities, working mandates, resources, skills, working cultures and norms come together to coordinate and collaborate to provide timely response and relief services. Thus, the terrain of managing catastrophic disasters is complex and requires a deeper study to understand and delineate the factors shaping and facilitating collaborative response and relief efforts.This study examines the multi-level and multi-layered collaborative response networks present at the national-international level, provincial and district/local level of disaster response and interactions. In this research the nature and effectiveness of collaboration is being studied through a relevant case study of a catastrophic natural disaster, the 2010 Pakistan Floods. The phase of immediate response is explored primarily through Network Theory perspectives including supportive theoretical perspectives such as Social Capital, Resource Dependency, and Institutional Collective Action Theory perspectives that help to explain collaborative interactions in disaster response networks. This study explores and describes factors that influence (either facilitate or hinder) collaboration is disaster response networks.The key research questions for this study are: What factors facilitate and impede collaborative response to catastrophic disasters at the local, provincial, national and international levels? What are the differences and similarities in response systems at different levels? Additional questions address how leadership support (attributed to government and political leaders and organizations), institutional support (in the form of plans, international appeals of response, and development of relief funds to manage aid), network capacity of different organizations (programmatic and relational), nature of resource dependencies between responding agencies, and structural configurations of response systems impact the collaborative response in disasters.A case study method has been applied in this research. The 2010 Pakistan Floods response network/system is identified through content analysis of various newspapers, situation reports and after-action reports using the Social Network Analysis (SNA) method via UCINET Software 6.1. The actual response network is analyzed and compared with existing national disaster response plans to examine the effectiveness of collaborative response through centrality measures, clique analysis and visual display. This approach is supplemented with semi-structured interviews of key institutional representatives that responded to the 2010 Floods. These organizations and institutions were primarily identified through the networks formulated via SNA.Findings and results from the analysis reflect that the response networks at each level of analysis differ both in structural aspects and also in functional aspects. The nature of the international-national response system is focused on mobilizing donor support and receiving and managing aid, both in-kind and cash. Also a major role at the international and national level is to mobilize the UN cluster approach and focus on broader aims of response such as providing shelter and food to affected areas. Some of the factors identified as facilitating collaborative response were leadership of both national and international leaders, and availability of donor support and funds.At the provincial level of analysis, the Chief Minister of Punjab is playing a central and influential role and is partnering closely with the Armed Forces and local district administration. Interviews conducted of provincial level officials help to support the hypotheses concerning leadership support's influence on collaborative response and also the role of institutional support in the form of creation of plans, and policies that help to mobilize quick funds and resources for relief. At the local level of response, networks are highly influenced by local conditions and local capacities of the district administration. Thus, there are diverse factors impacting each level of collaborative disaster response. All in all, leadership support, institutional support and network structural aspects are important variables that impact the effectiveness of collaborative response.Today policy makers are trying to figure out ways to collaborate successfully across sector boundaries for better and effective service delivery, both in the mundane operational tasks and in uncertain and complex situations such as disasters and catastrophic events. Thus, this research helps in expanding the literature on collaborative public management, collaborative emergency management, and network management. Also the frequency of natural disasters throughout the world demonstrate the need to study and examine factors that contribute to or hinder the effectiveness of inter-organizational response in disasters
Show less - Date Issued
- 2013
- Identifier
- CFE0005361, ucf:50496
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005361
- Title
- The Bridging Technique: Crossing Over the Modality Shifting Effect.
- Creator
-
Alicia, Thomas, Mouloua, Mustapha, Hancock, Peter, Szalma, James, Pharmer, James, University of Central Florida
- Abstract / Description
-
Operator responsiveness to critical alarm/alert display systems must rely on faster and safer behavioral responses in order to ensure mission success in complex environments such as the operator station of an Unmanned Aerial System (UAS). An important design consideration for effective UAS interfaces is how to map these critical alarm/alert display systems to an appropriate sensory modality (e.g., visual or auditory) (Sarter, 2006). For example, if an alarm is presented during a mission in a...
Show moreOperator responsiveness to critical alarm/alert display systems must rely on faster and safer behavioral responses in order to ensure mission success in complex environments such as the operator station of an Unmanned Aerial System (UAS). An important design consideration for effective UAS interfaces is how to map these critical alarm/alert display systems to an appropriate sensory modality (e.g., visual or auditory) (Sarter, 2006). For example, if an alarm is presented during a mission in a modality already highly taxed or overloaded, this can result in increased response time (RT), thereby decreasing operator performance (Wickens, 1976). To overcome this problem, system designers may allow the switching of the alarm display from a highly-taxed to a less-taxed modality (Stanney et al., 2004). However, this modality switch may produce a deleterious effect known as the Modality Shifting Effect (MSE) that erodes the expected performance gain (Spence (&) Driver, 1997). The goal of this research was to empirically examine a technique called bridging which allows the transitioning of a cautionary alarm display from one modality to another while simultaneously counteracting the Modality Shifting Effect.Sixty-four participants were required to complete either a challenging visual or auditory task using a computer-based UAS simulation environment while responding to both visual and auditory alarms. An approach was selected which utilized two 1 (task modality) x 2 (switching technique) ANCOVAs and one 2 (modality) x 2 (technique) ANCOVA, using baseline auditory and visual RT as covariates, to examine differences in alarm response times when the alert modality was changed abruptly or with the bridging technique from a highly loaded sensory channel to an underloaded sensory channel. It was hypothesized that the bridging technique condition would show faster response times for a new unexpected modality versus the abrupt switching condition. The results indicated only a marginal decrease in response times for the auditory alerts and a larger yet not statistically significant effect for the visual alerts; results were also not statistically significant for the analysis collapsed across modality. Findings suggest that there may be some benefit of the bridging technique on performance of alarm responsiveness, but further research is still needed before suggesting generalizable design guidelines for switching modalities which can apply in a variety of complex human-machine systems.
Show less - Date Issued
- 2015
- Identifier
- CFE0005568, ucf:50283
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005568
